Electricity may be measured as if it were a compressible gas, by
determining the potential it produces when stored in a defined
recipient. In this way the conception of a species of quantity is
reached. It is also measured as the quantity of current passed by a
conductor.

Thus a body whose surface is more or less highly charged with
electricity, is said to hold a greater or less quantity of electricity.

It may be defined in electrostatic or electro-magnetic terms. (See
Quantity, Electrostatic–Quantity, Electro-magnetic.)